Commit 78834b50d60b56239fc83ea59a23698b3b3bd7f0
2022-04-01T08:01:44
Add SDL_list.c/h
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diff --git a/src/SDL_list.c b/src/SDL_list.c
new file mode 100644
index 0000000..af9f8bf
--- /dev/null
+++ b/src/SDL_list.c
@@ -0,0 +1,93 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+#include "./SDL_internal.h"
+
+#include "SDL.h"
+#include "./SDL_list.h"
+
+/* Push */
+int
+SDL_ListAdd(SDL_ListNode **head, void *ent)
+{
+ SDL_ListNode *node = SDL_malloc(sizeof (*node));
+
+ if (node == NULL) {
+ return SDL_OutOfMemory();
+ }
+
+ node->entry = ent;
+ node->next = *head;
+ *head = node;
+ return 0;
+}
+
+/* Pop from end as a FIFO (if add with SDL_ListAdd) */
+void
+SDL_ListPop(SDL_ListNode **head, void **ent)
+{
+ SDL_ListNode **ptr = head;
+
+ /* Invalid or empty */
+ if (head == NULL || *head == NULL) {
+ return;
+ }
+
+ while ((*ptr)->next) {
+ ptr = &(*ptr)->next;
+ }
+
+ if (ent) {
+ *ent = (*ptr)->entry;
+ }
+
+ SDL_free(*ptr);
+ *ptr = NULL;
+}
+
+void
+SDL_ListRemove(SDL_ListNode **head, void *ent)
+{
+ SDL_ListNode **ptr = head;
+
+ while (*ptr) {
+ if ((*ptr)->entry == ent) {
+ SDL_ListNode *tmp = *ptr;
+ *ptr = (*ptr)->next;
+ SDL_free(tmp);
+ return;
+ }
+ ptr = &(*ptr)->next;
+ }
+}
+
+void
+SDL_ListClear(SDL_ListNode **head)
+{
+ SDL_ListNode *l = *head;
+ *head = NULL;
+ while (l) {
+ SDL_ListNode *tmp = l;
+ l = l->next;
+ SDL_free(tmp);
+ }
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
diff --git a/src/SDL_list.h b/src/SDL_list.h
new file mode 100644
index 0000000..a7ead1d
--- /dev/null
+++ b/src/SDL_list.h
@@ -0,0 +1,39 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_list_h_
+#define SDL_list_h_
+
+typedef struct SDL_ListNode
+{
+ void *entry;
+ struct SDL_ListNode *next;
+} SDL_ListNode;
+
+
+int SDL_ListAdd(SDL_ListNode **head, void *ent);
+void SDL_ListPop(SDL_ListNode **head, void **ent);
+void SDL_ListRemove(SDL_ListNode **head, void *ent);
+void SDL_ListClear(SDL_ListNode **head);
+
+#endif /* SDL_list_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */